In article ,
Ed Rasimus wrote:

Typical driver today probably never even gets one of those issued.

Yah. My first thought was that he'd found this one in the attic and
couldn't find the directions for it.

I use mine to calculate TAS once in a while. Sometimes I yank the
slide out because it's got mileage scales on the edges. That's
about it.

--
-Ed Falk,
http://thespamdiaries.blogspot.com/